From this link (http://androidcommunity.com/android-passes-ios-for-most-mobile-app-downloads-20111024/):
QuoteIn the second quarter of this year, Android accounted for 44% of all mobile app downloads, whereas Apple had only 31%.
Interesting stuff :)
Yes. View the paid contents and things change.
One thing to take into account here is that Android devices are made by a vast group of different companies, while Apple is by itself.
While I'm more on the hating than on the appreciating side when it comes to Apple, the data says they do a great job at marketing and their users are more prone to spend cash on software for its devices.